@article{Ní Bhrolcháin1992,
author = {Ní Bhrolcháin, M.},
title= {Age difference asymmetry and a two-sex perspective},
year = {1992},
doi = {10.1007/BF01797120},
journal = {European Journal of Population},
volume = {8},
number = {1},
pages = {23--45},
}